9231 P41 - Jun 2021 - Q1 - 7 marks
6791
A random sample of 7 observations of a variable \(X\) are as follows.
| 8.26 | 7.78 | 7.92 | 8.04 | 8.27 | 7.95 | 8.34 |
The population mean of \(X\) is \(\mu\).
(a) Test, at the \(10 \%\) significance level, the null hypothesis \(\mu=8.22\) against the alternative hypothesis \(\mu\lt 8.22\).
(b) State an assumption necessary for the test in part (a) to be valid.
Solutions and mark schemes for 9231 are temporarily available to admins only.